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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can be loosened and scrape the floor. This can be fixed by loosening the set screw of the top bracket a bit. The pivot pin on the top is a screw made of metal that is fitted into a plastic cap that has an end that is lipped and stays inside the track above the door. You'll also require a screwdriver, and possibly a pair pliers. Remove the Bottom Pin Bifold doors are ideal for saving space in closets but they may begin to buckle or scrape the floor or pop out of their bracket